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| 10/26/2018 4:54 PM | |
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Posts: 24 Rating:
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Hi all Need some help with ACS712 amp sensor and analog input scalling. Sensor is 0-20A Output voltage (from datasheet) is 2.5 - 4.5 V According to example from How do you scale measured values in LOGO! Soft Comfort? my calibration is: Gain: (20-0) / (4.5 - 2.5) = 10 Offset: 10 * (-2.5) *100 = -2500 After upload this values to LOGO i have properly done measurements near 6-10A but when is less then have about 1,5A of difference. What is a reason ? What a'm doing wrong ??? Additionally have measured output voltage from sensor when is 0A. There was 2,53V - not 2,5. In this situation cannot calculate gain because (20-0) / (4.5 - 2.53) = 10.1 (gain can be +/- 10 only). someone can help how to do it properly ? |
Last edited by: Jen_Moderator at: 10/29/2018 8:58:15 AMOptimized link. |
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| 10/26/2018 5:32 PM | |
Joined: 12/18/2014 Last visit: 12/5/2023 Posts: 31552 Rating:
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I have created an example for you. Based on the data of the sensor, 0.5V = -20.0 ° C and 4.5 V = 20.0 ° C. AttachmentScaling_0BA8.Standard.zip (132 Downloads) |
| 10/27/2018 3:42 AM | |
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Joined: 12/18/2014 Last visit: 12/5/2023 Posts: 31552 Rating:
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Sorry, I used the wrong units. Based on the data of the sensor, 0.5V = -20.0 A and 4.5 V = 20.0 A. I have corrected it. AttachmentScaling_0BA8_V2.Standard.zip (148 Downloads) |
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